Namibian astronomy: exploiting favorable conditions for multi-wavelength observatories

Namibia offers some of the most favourable environmental conditions for astronomical research worldwide. Its arid climate, and consistently clear skies provide extended observing windows throughout the year. As home to Africa’s first International Dark Sky Reserve, the country experiences exceptionally low levels of light pollution, supported by a sparse population and limited industrial activity. These factors create natural conditions ideal for astronomical observations across the electromagnetic spectrum. Long-term measurements at the High Energy Stereoscopic System (H.E.S.S.) site show night-sky brightness levels comparable to leading international observatories, confirming the stability of Namibia’s dark skies at these sites. Radio-frequency interference surveys at H.E.S.S. and Mt. Gamsberg reveal no significant interference across key astronomical bands, including those relevant for the planned Africa Millimetre Telescope. Together, these findings highlight Namibia’s exceptional potential for multi-wavelength astronomy, combining optical, gamma-ray, and millimetre-wavelength observations within one region. The results presented here strengthen the case for Namibia as a potential natural hub for coordinated astronomical infrastructure in the southern hemisphere.